Waste coal mine filler based on coal gangue

Abstract

The invention relates to the technical field of coal mine fillers, and particularly discloses a waste coal mine filler based on coal gangue. The filler comprises the following components in percentage by mass: 30%-40% of coal gangue, 20%-40% of cement, 10%-20% of sand, 5%-10% of fly ash, 10%-15% of lime, 0.5-1.5 kg/m < 3 > hybrid fibers and 3.5%-15% of an inorganic additive; the hybrid fibers are two or more selected from steel fibers, glass fibers, carbon fibers or basalt fibers; and the lengths of different fibers are different. The filler has high corrosion resistance, the strength can bear high stress generated by surrounding rock deformation, meanwhile, the fire resistance is high, and the grouting requirement of an underground coal mine roadway can be met.

Description

technical field [0001] The invention relates to the technical field of coal mine fillers, in particular to an abandoned coal mine filler based on coal gangue. Background technique [0002] Coal resource mining is an important guarantee for national energy security. At present, many mines in my country have entered the later stage of coal pillar recovery, and with the mining of coal pillars in the roadway, the underground pressure is serious, which brings serious safety problems. The research shows that the rheological characteristics of the surrounding rock will appear under the condition of high stress, and there will be unequal deformation in the whole process, and the floor heaving is the most common problem in the deformation of the surrounding rock. At the same time, under the action of high stress, the possibility of rock bursts in the deep underground during coal mining increases, and it causes uneven deformation of the roadway. During the continuous excavation proces...

AI Technical Summary

Problems solved by technology

[0005] The invention provides an abandoned coal mine filler based on coal gangue to solve the problem that the existing filler material has poor corrosion resistance, and its strength cannot bear

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